Sooner or later close down OnePlus unless they do repositioning of the brand's direction.
At least for Xiaomi in global markets, Xiaomi series is for premium sector, Redmi for mid to budget range and Poco solely for online affordable sales.
Oppo X series for premium, Reno series for mid range and the A series for budget. Realme series for the affordable sector. OnePlus seems like neither here nor there. Probably it will just merge back with Oppo or combine with Realme eventually.